Kotlin: Add a Kotlin 2 copy of the testsuite

java/ql/test-kotlin2/library-tests/java-lang-number-conversions/Test.java

@@ -0,0 +1,27 @@
+public class Test {
+
+  byte b;
+  short s;
+  int i;
+  long l;
+  float f;
+  double d;  
+
+  public void test(Number n, Byte b2) {
+
+    b = n.byteValue();
+    s = n.shortValue();
+    i = n.intValue();
+    l = n.longValue();
+    f = n.floatValue();
+    d = n.doubleValue();
+    b = b2.byteValue();
+    s = b2.shortValue();
+    i = b2.intValue();
+    l = b2.longValue();
+    f = b2.floatValue();
+    d = b2.doubleValue();
+
+  }
+
+}